R2023T-E2-F Datasheet, PDF (19/56 Pages) RICOH electronics devices division – 2-wire Serial Interface Real Time Clock IC

* R2023K (FFP12) is the discontinued product as of February, 2016.
R2023x
• Calendar Counter (Address 4-6h)
Day-of-month Counter (Address 4h)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
D20
D10
D8
D4
D2
D1
0
0
D20
D10
D8
D4
D2
D1
0
0 Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite
(For Writing)
(For Reading)
Default Settings *)
Month Counter + Century Bit (Address 5h)
D7
D6
D5
D4
19 /20
-
-
MO10
D3
MO8
D2
MO4
D1
MO2
D0
MO1
(For Writing)
19 /20
0
Indefinite 0
0
MO10
MO8
MO4
MO2
MO1
(For Reading)
0 Indefinite Indefinite Indefinite Indefinite Indefinite Default Settings *)
Year Counter (Address 6h)
D7
D6
D5
D4
D3
D2
D1
D0
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
(For Writing)
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
(For Reading)
Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Default Settings *)
*) Default settings: Default value means read / written values when the PON bit is set to “1” due to VDD
power-on from 0 volts.
* The calendar counters are configured to display the calendar digits in BCD format by using the automatic
calendar function as follows:
The day-of-month digits (D20 to D1) range from 1 to 31 for January, March, May, July, August, October,
and December; from 1 to 30 for April, June, September, and November; from 1 to 29 for February in leap
years; from 1 to 28 for February in ordinary years. The day-of-month digits are carried to the month digits
in reversion from the last day of the month to 1. The month digits (MO10 to MO1) range from 1 to 12 and
are carried to the year digits in reversion from 12 to 1.
The year digits (Y80 to Y1) range from 00 to 99 (00, 04, 08, …, 92, and 96 in leap years) and are carried
to the 19 /20 digits in reversion from 99 to 00.
The 19 /20 digits cycle between 0 and 1 in reversion from 99 to 00 in the year digits.
* Any carry from lower digits with the writing of non-existent calendar data may cause the calendar counters
to malfunction. Therefore, such incorrect writing should be replaced with the writing of existent calendar
data.
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